Ключевые слова: background, chemical, chemistry, chimney, construction, dark, distillation, distillery, ecology, economy, energy, engineering, environment, evening, factory, gas, hydrocarbon, industrial, industry, manufacture, manufacturing, metal, night, oil, old, petrochemical, petrol, petroleum, pipe, pipeline, plant, pollution, power, pressure, production, reaction, refinery, separation, separator, smoke, stack, storage, sunrise, sunset, supply, tank, technology, tower, tube, twilight,